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Finding the Fourth Proportional to 80.64, 120.12 and 79.20

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Solution

The fourth proportional to 80.64, 120.12 and 79.20 is: 117.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.64 : 120.12 = 79.20 : x
  2. Step 2: Convert to fraction form
    80.64/120.12 = 79.20/x
  3. Step 3: Cross multiply
    80.64x = 120.12 × 79.20
  4. Step 4: Simplify right side
    80.64x = 9,513.50
  5. Step 5: Solve for x
    x = 9,513.50/80.64
  6. Step 6: Final answer
    x = 117.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.